I noticed that too. But she was firing right under the other cop, and the best evidence of an actual shot fired was how fast the other cop jumped back several steps. Definitely scared him.
Right before he steps back in reaction he looks down to see a Glock ejection port and barrel four inches from his face. Not to mention the woman screeching incessantly about a taser. That would be similar to having a coiled rattler sounding off in-your-face.... and would cause a bit of flight panic for sure.
A Glock, with it's Browning derived cam-lock barrel system moves even with a double handed, firm hold. single handed... more dramatically. Yet even at half speed watching over and over, I see (and hear) nothing as far as evidence that the pistol fired.